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Finding the Fourth Proportional to 936.18, 1,292.18 and 641.38

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Solution

The fourth proportional to 936.18, 1,292.18 and 641.38 is: 885.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.18 : 1,292.18 = 641.38 : x
  2. Step 2: Convert to fraction form
    936.18/1,292.18 = 641.38/x
  3. Step 3: Cross multiply
    936.18x = 1,292.18 × 641.38
  4. Step 4: Simplify right side
    936.18x = 828,778.41
  5. Step 5: Solve for x
    x = 828,778.41/936.18
  6. Step 6: Final answer
    x = 885.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.